Time Travel Loops, Causation, and the Cosmological Argument for the Existence of God

Causal loops are weird to think about. But so are infinite chains. And finite ones! If our minds have trouble processing all of the options, can we really conclude anything about external reality?

A few weeks ago, I wrote about why so few time travel movie make any sense. They key point was that if we’re supposed to believe that, say, Marty McFly is traveling back to the actual past of his own universe, whatever he does during that trip definitionally happened before he got in the DeLorean and already had whatever effect it was going to have on t…